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Dental Assistants

Sheila Simonsen

Sheila joined the Broadway Dental family as a certified and Registered Dental Assistant in 2000. She was certified through the Dental Assisting Program at Iowa Western Community College and is certified to perform expanded duty functions.

Sheila lives in Manilla with her husband, Bill, and their children, Mason and Makenna. In her spare time Sheila enjoys constructing puzzles with her children, reading, and going for walks.

Photo of MandyMandy Sandvold

Mandy is a Certified and Registered Dental Assistant with expanded duty function certification. She is a graduate of Iowa Western Community College in Council Bluffs and joined Broadway Dental in 2003.

Mandy and her husband were married in 2001 and have four children. In her spare time she enjoys swimming, walking, going for drives, playing at the park, and watching movies with her family.


  • Denison Office: Tuesday, Wednesday, Thursday

Tami McCollough

Tami graduated from Des Moines Area Community College (DMACC) in 2009. She joined the Broadway Dental Team as a Registered/Certified Pediatric Dental Assistant in 2012 and is now an Expanded Functions Dental Assistant.

Tami is originally from Schleswig and now resides on an acreage east of Denison with her husband, Brad, two daughters, Hallie and Aubrie, and their three sons Dierk, Trace and Clay. Brad and Tami run a farm in addition to raising show cattle and Labrador Retrievers. Tami enjoys spending time on the farm with her family, horseback riding, and teaching her girls how to care for the animals.


  • Denison Office: Tuesday, Thursday, Friday

Photo of CarmenCarmen Terwilleger

Carmen is a Certified/Registered Dental Assistant with expanded duty function certification.  She gained her Dental Assistant Certification from Western Iowa Tech Community College in 2011 after receiving an Associates Degree from DMACC in 2010

Carmen grew up on a farm between Charter Oak and Ute. She now lives in Charter Oak with her husband John and sons Kelby and Rhett. Outside of work, she stays busy with her boys and also loves reading, shopping and spending time with her family.


  • Denison Office: Monday-Thursday

Photo of AndreaAndrea Monahan

Andrea joined Broadway Dental in October 2012 as a Registered and Certified Dental Assistant with qualifications to perform expanded duty functions. She attended DMACC in Ankeny and graduated with her dental assisting degree in September 2007.

Andrea and her husband, Zach, live in Glidden with their three children Caleb, McKenna, and Crew. In her free time Andrea enjoys spending time with family and friends, watching sports, crafts and photography.


  • Denison Office: Tuesday-Friday

Photo of HaleyHaley Thoreson

Haley is an Expanded Functions Dental Assistant who graduated from Des Moines Area Community College in Ankeny and joined the Broadway Dental team in 2013.

Haley was born and raised in Denison and now resides in Charter Oak with her husband, Colton and new daughter, Wrenley. In her free time she enjoys hunting, fishing, traveling and playing slow-pitch softball.


  • Denison Office: Tuesday-Friday

Cheri Hadden

Cheri graduated from Iowa Western Community College in 2012. She joined the Broadway Dental team in 2016 and received her Expanded Function Certification in 2017.

Cheri grew up in Ute and then moved to Soldier to start a family with her husband, Adam. Together they have two children, Quinn who is 4 and Nora who is 2. They are expecting their third little girl in February 2021.


  • Denison Office: Monday
  • Woodbine Office: Tuesday-Thursday

Casey Carstens

Casey graduated from Iowa Western Community College in 2018. She joined the Broadway Dental team in 2019 as a Registered Dental Assistant and then received her Expanded Functions Certification in 2020.

Casey grew up in the Ute area and recently bought a house in Soldier with her significant other, Jay. She enjoys spending time with her family and friends and her dog, Kunga. In her free time can catch Casey seeing a movie, traveling and watching the Kansas City Chiefs play football!

Photo of Madison

Madison Hast

Madison is certified and registered Dental Assistant. She graduated Des Moines Area Community College in July 2020 and joined our Broadway Dental team in August of 2020.

Madison grew up in Dow City and currently still lives there. In her free time, she enjoys spending time with friends and family, being outside and watching sports.

Photo of Karen

Karen Muell

Karen Muell joined the Broadway Dental team in September 2020. She brings with her many years of experience, that all started with her graduating from Iowa Western Community College Dental Assisting program.

Karen grew up in the Panama area and still lives there today with her husband, Dale. They raise crops and have feeder cattle, which keeps her busy when not at the dental office.

They have three grown sons, two grandsons, and two wonderful women in their sons’ lives. Karen loves spending time with her family and enjoying many outdoor activities in her free time.

Photo of Ann

Ann Ahart

Ann originally grew up in Denison and graduated high school year there. After High school, she went to Iowa Western Community College and received her Dental Assisting Certificate in 2019. After college she worked in a Council Bluffs office before making her way back to her hometown.

Ann enjoys spending time with family and friends and loves to be outdoors as much as possible.